Difficult sudoku #970
| 9 | ||||||||
| 4 | 9 | 7 | ||||||
| 6 | 3 | 1 | ||||||
| 7 | 6 | 1 | 4 | |||||
| 3 | ||||||||
| 1 | 8 | |||||||
| 7 | 8 | |||||||
| 9 | 4 | 2 | 7 | |||||
| 5 | 3 | 4 |
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